WASP-52

WASP-52 is a K-type main-sequence star about 570 light-years away. It is older than the Sun at 10.7+1.9
−4.5 billion years, but it has a similar fraction of heavy elements.[3] The star has prominent starspot activity, with 3% to 14% of the stellar surface covered by areas 575±150 K cooler than the rest of the photosphere.[6]

WASP-52

Observation data Epoch J2000      Equinox J2000
Constellation	Pegasus
Right ascension	23^h 13^m 58.7576^s[1]
Declination	08° 45′ 40.5713″[1]
Apparent magnitude (V)	12.0
Characteristics
Evolutionary stage	Main sequence
Spectral type	K2V[2]
Astrometry
Radial velocity (Rv)	-26.604[1] km/s
Proper motion (μ)	RA: -6.942[1] mas/yr Dec.: -44.330[1] mas/yr
Parallax (π)	5.7262 ± 0.0134[1] mas
Distance	570 ± 1 ly (174.6 ± 0.4 pc)
Details[3]
Mass	0.87±0.03 M☉
Radius	0.79±0.02 R☉
Surface gravity (log g)	4.58±0.01[4] cgs
Temperature	5000±100 K
Metallicity [Fe/H]	0.03±0.12 dex
Rotation	16±2 d[4]
Rotational velocity (v sin i)	1.77^+0.19 −0.20[5] km/s
Age	10.7^+1.9 −4.5 Gyr
Other designations
Anadolu, Gaia EDR3 2666015878575546496, 2MASS J23135873+0845405[2]
Database references
SIMBAD	data

A multiplicity survey in 2015 did not detect any stellar companions.[7] The star was named Anadolu in 2019 by Turkish astronomers as part of the "nameexoworlds" contest.[8]

Planetary system

In 2012 a transiting hot Jupiter planet, WASP-52b, was detected in a tight, circular orbit.[4] The planet was named Gokturk by Turkish astronomers in December 2019.[8] Its equilibrium temperature is 1315±35 K[4] and its orbit is well aligned with the equatorial plane of the star, the misalignment being 5.47^+4.61
_−4.21°.[5]

A transmission spectrum taken in 2020 has revealed the presence of H, Na and K,[9] although the Na and K lines may be attributable to volcanically active moons of the gas giant, not the planet itself.[10] The atmosphere has no high winds and relatively low-lying clouds, indicating it is not significantly enriched by heavy elements.[11] No signs of the planetary atmosphere escaping to space were detected.[12]

The WASP-52 planetary system[3]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
WASP-52b (Gokturk)	0.459^+0.022 −0.021 MJ	0.02713^+0.00031 −0.00032	1.7497835±0.0000011	<0.092	85.35±0.20°	1.27±0.03 RJ

References

1. Brown, A. G. A.; et al. (Gaia collaboration), "Gaia Early Data Release 3: Summary of the contents and survey properties", Astronomy & Astrophysics (in press), arXiv:2012.01533, doi:10.1051/0004-6361/202039657, S2CID 227254300 Gaia EDR3 record for this source at VizieR.
2. "WASP-52". SIMBAD. Centre de données astronomiques de Strasbourg.
3. Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; et al. (2017), "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy & Astrophysics, A107: 602, arXiv:1704.00373, Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID 118923163
4. Hébrard, G.; Collier Cameron, A.; Brown, D. J. A.; Díaz, R. F.; Faedi, F.; Smalley, B.; Anderson, D. R.; Armstrong, D.; Barros, S. C. C.; Bento, J.; Bouchy, F.; Doyle, A. P.; Enoch, B.; Gómez Maqueo Chew, Y.; Hébrard, É. M.; Hellier, C.; Lendl, M.; Lister, T. A.; Maxted, P. F. L.; McCormac, J.; Moutou, C.; Pollacco, D.; Queloz, D.; Santerne, A.; Skillen, I.; Southworth, J.; Tregloan-Reed, J.; Triaud, A. H. M. J.; Udry, S.; et al. (2012), "WASP-52b, WASP-58b, WASP-59b, and WASP-60b: four new transiting close-in giant planets", Astronomy & Astrophysics, 549: A134, arXiv:1211.0810, doi:10.1051/0004-6361/201220363, S2CID 54502046
5. Oshagh, M.; Triaud, A. H. M. J.; Burdanov, A.; Figueira, P.; Reiners, A.; Santos, N. C.; Faria, J.; Boue, G.; Díaz, R. F.; Dreizler, S.; Boldt, S.; Delrez, L.; Ducrot, E.; Gillon, M.; Guzman Mesa, A.; Jehin, E.; Khalafinejad, S.; Kohl, S.; Serrano, L.; Udry, S. (2018), "Activity induced variation in spin-orbit angles as derived from Rossiter-McLaughlin measurements", Astronomy & Astrophysics, 619: A150, arXiv:1809.01027, Bibcode:2018A&A...619A.150O, doi:10.1051/0004-6361/201833709, S2CID 54578441
6. Rosich, A.; Herrero, E.; Mallonn, M.; Ribas, I.; Morales, J. C.; Perger, M.; Anglada-Escudé, G.; Granzer, T. (2020), "Correcting for chromatic stellar activity effects in transits with multiband photometric monitoring: Application to WASP-52", Astronomy and Astrophysics, 641: A82, arXiv:2007.00573, Bibcode:2020A&A...641A..82R, doi:10.1051/0004-6361/202037586
7. Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579
8. 'Anadolu' and 'Göktürk': Turkey names its star and planet
9. Chen, G.; Casasayas-Barris, N.; Pallé, E.; Yan, F.; Stangret, M.; Cegla, H. M.; Allart, R.; Lovis, C. (2020), "Detection of Na, K, and Hα absorption in the atmosphere of WASP-52b using ESPRESSO", Astronomy & Astrophysics, 635: A171, arXiv:2002.08379, Bibcode:2020A&A...635A.171C, doi:10.1051/0004-6361/201936986, S2CID 211204947
10. Oza, Apurva V.; Johnson, Robert E.; Lellouch, Emmanuel; Schmidt, Carl; Schneider, Nick; Huang, Chenliang; Gamborino, Diana; Gebek, Andrea; Wyttenbach, Aurelien; Demory, Brice-Olivier; Mordasini, Christoph; Saxena, Prabal; Dubois, David; Moullet, Arielle; Thomas, Nicolas (2019), "Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets", The Astrophysical Journal, 885 (2): 168, arXiv:1908.10732, Bibcode:2019ApJ...885..168O, doi:10.3847/1538-4357/ab40cc, S2CID 201651224
11. Bruno, Giovanni; Lewis, Nikole K.; Alam, Munazza K.; López-Morales, Mercedes; Barstow, Joanna K.; Wakeford, Hannah R.; Sing, David K.; Henry, Gregory W.; Ballester, Gilda E.; Bourrier, Vincent; Buchhave, Lars A.; Cohen, Ofer; Mikal-Evans, Thomas; García Muñoz, Antonio; Lavvas, Panayotis; Sanz-Forcada, Jorge (2020), "WASP-52b. The effect of starspot correction on atmospheric retrievals", Monthly Notices of the Royal Astronomical Society, 491 (4): 5361–5375, arXiv:1911.05179, Bibcode:2020MNRAS.491.5361B, doi:10.1093/mnras/stz3194, S2CID 207930165
12. Vissapragada, Shreyas; Knutson, Heather A.; Jovanovic, Nemanja; Harada, Caleb K.; Oklopčić, Antonija; Eriksen, James; Mawet, Dimitri; Millar-Blanchaer, Maxwell A.; Tinyanont, Samaporn; Vasisht, Gautam (2020), "Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultra-Narrowband Photometry", The Astronomical Journal, 159 (6): 278, arXiv:2004.13728, Bibcode:2020AJ....159..278V, doi:10.3847/1538-3881/ab8e34, S2CID 216641813